Why can defining species sometimes be difficult?

A population of birds gets separated by a newly formed river. Over thousands of years, the two groups evolve independently and develop differences in their songs and mating behaviors. When they come into contact again, they no longer recognize each other as mates and do not interbreed. What has occurred?

Which of the following is an example of how an environmental disturbance could contribute to speciation?

Question 1Please hold up your RIT student ID or any ID so you can mimic what you will need to do on the day of your Honorlock proctored Exam 1.

A population of lizards is separated by a volcanic eruption, forming two isolated groups. Over many generations, small genetic differences accumulate due to mutations, natural selection, and genetic drift. After thousands of years, individuals from the two groups come into contact again but can no longer successfully mate. Which statement below best summarizes what this scenario has demonstrated about evolution?

Question 2This question is to give you practice with how you will show me your cheat sheet while taking Part 1 and Part 2 of the upcoming exam. You will be prompted to hold up your cheat sheet at the start of Part 1, turn it over and show me both sides and then lay it face down in front of you. (By the way, you may use the back of the cheat sheet for scrap paper if you need to since it is blank.) Hold up any piece of paper and show me both sides and lay it down. This is a test run so it does not matter what is on the paper. 

Question 4This question is located on page 2 of the Honorlock practice quiz and mimics the type of open-ended question you will need to complete. There is no need to insert any images. You can type all your responses.  Use this space to share any concerns with me about the Honorlock proctoring system. If you had major concerns, also email me right away so that I do not miss a potential issue before the upcoming exam. When you are done, submit the quiz. 

Hold your completed pages, one at a time, up to the webcam, so we can see what you have written before scanning it on the next step.  

According to the syllabus, office hours are available on which day from the choices below?

What is the first day of the term?